Yamaha PortaSound PSS-780 Operating Manual page 41

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Set the PSS-780 MIDI MODE to 00, and make sure the
PortaSound transmission channels and the tone generator/
rhythm machine reception channels correspond. It is also
a good idea to adjust the tone generator voice numbers
(e.g. setting P.Change to "individual" on the TX81Z) so
that choosing a PortaSound voice will automatically select
a corresponding external voice.
Don't forget to make use of the PSS-780's MIDI OUT
channel assignment possiblities. For instance, you can let
each MELODY memory bank and Auto Accompaniment
part play a different tone generator voice.
PortaSound — MIDI Recorder
To greatly expand the scope of the SONG MEMORY,
you can connect your PortaSound to a MIDI recorder
such as the EMQ-1.
PSS-780
The EMQ-1 now allows you to record and overdub on
several channels. If you set the PSS-780 to "00" mode,
you can record in real time. Set the PortaSound to "99"
mode when receiving data from the EMQ-1.
All performances can be saved on disks, so you can create
your own music library. Besides, you can use the EMQ-1
for data filing (bulk dumps), thus storing your digital
synthesizer settings, SONG MEMORY contents and
custom drum patterns on disks. When transmitting data
to, or receiving data from the EMQ-1, either mode will
do, but you should set the PSS-780 to "00" mode when
you actually use the received data.
PortaSound — Sequencer
The SONG MEMORY functions of the PortaSound
PSS-780 are flexible and very easy — but they do not let
you edit any of the memorized note data. This becomes
possible when you connect the PortaSound to a sequencer
as follows.
PSS-780
Now, all you have to do is use the SONG MEMORY as
usual, then play back your recording in 00 mode while
transmitting it to the sequence recorder. (Of course, you
can also record "live" with the QX5FD without using the
PortaSound SONG MEMORY at all). The QX5FD then
allows you to edit (change) this data any way you want,
adding, deleting and repeating parts or making your music
more expressive with velocity dynamics. (When controlling
the PortaSound from the QX5FD, set the MIDI mode
to 99.)
With this hookup, you can also use the sequencer to store
system exclusive data (such as the Digital Synthesizer
settings) and load them back to the PSS-780. You thus
have a limitless number of banks for SONG MEMORY,
DIGITAL SYNTHESIZER, etc. at your disposal.